var draw = function(canvas) {
  var context = canvas.getContext('2d');

  var a = context;
  var b = document.body;
  var c = canvas;

  document.body.clientWidth;
  var zBuffer = [];
  var SIZE = 777;
  canvas.width = canvas.height = SIZE;
  var h = -350;

  function surface(a, b, c) {
      if (c > 60) {
          return {
              x : Math.sin(a * 7) * (13 + 5 / (.2 + Math.pow(b * 4, 4)))  - Math.sin(b) * 50,
              y : b * SIZE + 50,
              z : 625 + Math.cos(a * 7)   * (13 + 5 / (.2 + Math.pow(b * 4, 4))) + b * 400,
              r : a * 1 - b / 2,  g : a  };
      }

      var A = a * 2 - 1;
      var B = b * 2 - 1;

      if (A * A + B * B < 1) {
          if (c > 37) {
              var j = c & 1;
              var n = j ? 6 : 4;
              var o = .5 / (a + .01) + Math.cos(b * 125) * 3 - a * 300;
              var w = b * h;
              return {
                  x : o * Math.cos(n) + w * Math.sin(n) + j * 610 - 390,
                  y : o * Math.sin(n) - w * Math.cos(n) + 550 - j * 350,
                  z : 1180 + Math.cos(B + A) * 99 - j * 300,
                  r : .4  - a  * .1   + Math.pow(1 - B * B, -h * 6)  * .15  - a  * b  * .4   + Math.cos(a + b)  / 5   + Math.pow(Math.cos((o * (a + 1) + (B > 0 ? w  : -w)) / 25), 30) * .1 * (1 - B * B),  g : o / 1e3 + .7 - o * w * 3e-6
              };
          }

          if (c > 32) {
              c = c * 1.16 - .15;
              var o = a * 45 - 20;
              var w = b * b * h;
              var z = o * Math.sin(c) + w * Math.cos(c) + 620;
              return {
                  x : o * Math.cos(c) - w * Math.sin(c),
                  y : 28 + Math.cos(B * .5) * 99 - b * b * b * 60 - z / 2  - h,
                  z : z,
                  r : (b * b * .3 + Math.pow((1 - (A * A)), 7) * .15 + .3)  * b,
                  g : b * .7
              };
          }

          var o = A * (2 - b) * (80 - c * 2);
          var w = 99 - Math.cos(A) * 120 - Math.cos(b) * (-h - c * 4.9)  + Math.cos(Math.pow(1 - b, 7)) * 50 + c * 2;
          var z = o * Math.sin(c) + w * Math.cos(c) + 700;
          return {
              x : o * Math.cos(c) - w * Math.sin(c),
              y : B * 99 - Math.cos(Math.pow(b, 7)) * 50 - c / 3 - z  / 1.35 + 450,  z : z,
              r : (1 - b / 1.2) * .9 + a * .1,
              g : Math.pow((1 - b), 20) / 4 + .05
          };
      }
  }



  setInterval(function() {
      for ( var i = 0; i < 100000; i++) {
          var part = i % 46;
          var c = part / .74;
          var point = surface(Math.random(), Math.random(), c);
          if (point) {
              var z = point.z;
              var x = parseInt(point.x * SIZE / z - h);
              var y = parseInt(point.y * SIZE / z - h);
              var zBufferIndex = y * SIZE + x;
              if ((typeof zBuffer[zBufferIndex] === "undefined")  || (zBuffer[zBufferIndex] > z)) {
                  zBuffer[zBufferIndex] = z;
                  var r = -parseInt(point.r * h);  var g = -parseInt(point.g * h);
                  var b = -parseInt(point.r * point.r * -80);
                  context.fillStyle = "rgb(" + r + "," + g + "," + b  + ")";
                  context.fillRect(x, y, 1, 1);
              }
          }
      }
  }, 0);
}

export {
    draw
}